关于java下载excel,pdf等demo

最新推荐文章于 2022-05-07 20:52:20 发布

原创最新推荐文章于 2022-05-07 20:52:20 发布 · 338 阅读

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本文介绍了一种使用前端JavaScript创建并触发a标签点击事件来实现文件下载的方法，并展示了如何通过后端Java代码设置响应头及使用输入输出流完成PDF文件的下载。

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首先关于触发事件应该a标签事件

var url=“http://www.w3school.com.cn/tags/att_a_target.asp”;

var a = document.createElement("a");
    a.setAttribute("href", url);
    a.setAttribute("target", "_blank");
    a.setAttribute("id", "openwin");
    document.body.appendChild(a);
    a.click();

这个是前台调用的地方后台代码简单主要运用输入输出流

@RequestMapping(params = "actionMethod=getHelpPdf")
   public void getHelpPdf(HttpServletRequest request,HttpServletResponse response, Model model) throws Exception {
       String filePath = Parameter.getInstance().getProp().getProperty("helpPath")+"help.pdf";
       String helpName = Parameter.getInstance().getProp().getProperty("helpName");
                String filename = helpName+" .pdf";
                if (null != filename) {
                    filename = filename.trim();
                }
                response.setCharacterEncoding("utf-8");
               response.setContentType("application/pdf");
                response.setHeader("Content-Disposition", "attachment;fileName=" + filename);
                String agent = request.getHeader("USER-AGENT").toLowerCase();
               String codedFileName = java.net.URLEncoder.encode(filename, "UTF-8");
               if (agent.contains("firefox")) {
                   response.setHeader("Content-Disposition", "attachment; filename="
                           + new String(filename.getBytes("gb2312"), "ISO8859-1"));
               } else {
                   response.setHeader("content-disposition", "attachment;filename="
                           + codedFileName);
               }
                try {
                    File file = new File(filePath);
                    System.out.println(file.getAbsolutePath());
                    InputStream inputStream = new FileInputStream(file);
                    OutputStream os = response.getOutputStream();
                    byte[] b = new byte[1024];
                    int length;
                    while ((length = inputStream.read(b)) > 0) {
                        os.write(b, 0, length);
                    }
                    os.flush();
                    os.close();
                    inputStream.close();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
   }